#include<fstream>
using namespace std;

int cmmdc (int a, int b) {
while (a!=b)
{if (a>b) a=a-b; else b=b-a;

}
return b;
}
int main(){
    int n, i, j, k=0;
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    fin>>n;
    for(i=1;i<=n;i++)
    for(j=1;j<=n;j++)
    { if( cmmdc(i,j)==1) {k=k+1;}
    }
    fout<<k;
    fin.close();
    fout.close();
}